ICS9FG108D

Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA

1542E

12/16/10

Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA

DATASHEET

1

Description

ICS9FG108D is a Frequency Timing Generator that provides 8

differential output pairs that are compliant to the Intel CK410

specification.

It also provides support for PCI-Express, next

generation I/O, and SATA. The part synthesizes several output

frequencies from either a 14.31818 MHz crystal or a 25 MHz crystal.

The device can also be driven by a reference input clock instead of

a crystal. It provides outputs with cycle-to-cycle jitter of less than 50

ps and output-to-output skew of less than 65 ps. ICS9FG108D also

provides a copy of the reference clock. Frequency selection can be

accomplished via strap pins or SMBus control.

Key Specifications

•

Output cycle-to-cycle jitter < 50 ps

•

Output to output skew < 65 ps

•

+/-300 ppm frequency accuracy on output clocks

•

+/-50 ppm at any frequency with spread off

Features/Benefits

•

Generates common frequencies from 14.318 MHz or

25 MHz

•

Crystal or reference input

•

8 - 0.7V current-mode differential output pairs

•

Supports Serial-ATA at 100 MHz

•

Two spread spectrum modes: 0 to -0.5 down spread

and +/-0.25% center spread

•

Unused inputs may be disabled in either driven or Hi-Z

state for power management.

Functional Block Diagram

STOP

LOGIC

XIN/CLKIN

X2

DIF(7:0)

CONTROL

LOGIC

SPREAD

FS(2:0)

SDATA

SCLK

SEL14M_25M#

DIF_STOP#

PROGRAMMABLE

SPREAD PLL

8

IREF

OSC

R E FO U T

OE(7:0)